"Black-chinned Hummingbirds are very common during the summer months! They love flowering plants and sugar water. Feeders should be filled with homemade sugar water with a 1:4 ratio of sugar to water, mixed thoroughly until all the sugar is dissolved. Water should be changed at least weekly, otherwise it may harm or even kill the birds." -Billie Helean, Local teacher and bird enthusiast
Original source found here.